減壓倒流防止閥組由前後控制閥、Y型過濾器和倒流防止器組成閥組中的倒流防止器是一種防止壓力回流和虹吸回流的液壓控制裝置，

嚴格限制壓力水進入管道只能向一個方向流動。

The pressure reducing backflow preventer valve group is composed of front and rear control valves,

Y-type filter and backflow preventer The backflow preventer in the valve group is a hydraulic control

device that prevents pressure backflow and siphon backflow and strictly limits that the pressure water

in the pipeline can only flow in one direction.